Quote (FMX_89 @ Oct 21 2013 10:48am)
It would be hard to list 3 but my top 5 have already been mentioned.
if by DD engine you mean the maintenance schedule is followed correctly I would venture to say a 12 valve p-pump cummins would outlast nearly everything.
A gen 1 SBC, 3800 series II, 300 I6, and 4.0 jeep I6 are all tied for my "don't do anything but add oil when necessary and still crack 300k mi" award.
Any cummins will last forever with proper maintenance. The 1st gen (intercooled) 2nd gen 12v's and the 6.7's are some of the toughest motors i've dealt with. Thats if left with stock fueling and deletes done.